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The P-Block Elements

Question
CBSEENCH12011123

Which is the strongest acid in the following?

  • H2SO4

  • HClO3

  • HClO4

  • H2SO3

Solution

C.

HClO4

The strength of oxyacids can also be decided with the help of the oxidation number of the central atom. Higher the oxidation number of central atoms, more acidic is the oxyacid. 
straight H subscript 2 straight S with plus 6 on top straight O subscript 4 comma space straight H Cl with plus 5 on top straight O subscript 3 space straight H Cl with plus 7 on top straight O subscript 4 comma space straight H subscript 2 straight S with plus 4 on top straight O subscript 3
Since in HClO3 oxidation number of Cl is highest, so  HClO4 is the strongest acid among the given.